This is getting way off topic, but:
On 5/11/10 3:55 PM +0300, Nicolas Barbier wrote:
T2> SELECT i FROM a WHERE i = 1 FOR SHARE; -- Lock a with i = 1 FOR SHARE.
i
---
1
(1 Zeile)
T2> SELECT a_id FROM b WHERE a_id = 1; -- Check whether it's got
anything pointing to it.
a_id
------
(0 Zeilen)
T2> DELETE FROM a WHERE i = 1; -- Nope, so delete a with i = 1 (this
blocks, because T1 is still holding the lock).
Obviously you wouldn't delete anything with a SHARE lock.
Regards,
Marko Tiikkaja
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